johnson



UNITED STATES PATENT OFFICE.

W. J. JOHNSON, OF NEXVTON, MASSACHUSETTS.

IPUMP.

Specification forming part of Letters Patent No. 30,480, dated October23, 1860; Reissued September 21, 1875, No. 6,649.

To all whom it may concern:

Be it known that I, W'. J. JOHNSON, of Newton, in the county ofMiddlesex and State of Massachusetts, have invented a new and usefulImprovement in Pumps; and I do hereby declare that the following is affull, clear, and exact description of the same,

reference being had to the accompanying drawings, forming a part of thisspecification, in which Figure l, represents a central section of thepump. Fig. 2, a plan of a stirrup attached to the pump, and Figs. 3 and1l, represent a plan and side view of a modification of said stirrup.

Similar letters of reference, in each of the several gures, indicatecorresponding parts. To enable others, skilled in the art, to make anduse my invention, I will proceed to describe its construction andoperation.

The cylinder D, of lthis pump bulges out at its bottom end, as seen inFig. 1, and is there provided with perforat-ions E, through which thewater is to be sucked into the cylinder. Immediately above this portionof the cylinder a ball valve V, is arranged which closes the opening X,in the valve` seat and cuts oft the communication of the.

space of the cylinder above said ball valve' stuflng box thus formed bythe cap` K, and

collar Gr. The piston J, is hollow and is connected to the end of thepiston rod by flanges forming open spaces S between them. A ball playingin the cavit` of the piston serves to close the piston while it ascends.The ball rises and allows the water to pass through the piston andopenings S,into the space between the piston rod and cylinder, while thepiston descends.

The diameter of the piston rod is made one half of the inner diameter ofthe pump,l

cylinder, by which means half the water the cylinder holds will bedischarged during the ascent and the other half during the descent ofthe piston. During the ascent of the piston, the valve I, closes andconsequently all the water above the piston and between the piston rodand inner surface of the cylinder-this quantity of water being equal toone half the capacity of the whole cylinder, as above set forth-islifted together with the piston and discharged at H. During all the timeof the ascent of the piston, the valve V, is lifted up and kept by thewater rushing through the orifices E, and the seat of valve V, intothevacuum created in the cylinder by the ascent of the piston. During thedescent of the piston, the weight of the column of water in the cylindercloses the valve V, and the resistance of the water keeps the pistonvalve I, open. While the piston and piston rod descend, the latteroccupying one half of the hollow space of the cylinder, one half of thewater contained in the cylinder will be forced out at the orilice H,while the other half lills the space between the piston rod and innersurface of the cylinder, ready to be lifted and discharged during thenext ascent of the piston, as above described. Thus it will be seen, thepump is made to be double acting, and all the water the cylinder holds,is discharged during one reciprocation of the piston.

The operator places the pump with its bottom end into a vesselcontaining water and keeps it down while operating the piston by puttinghis foot upon a stirrup A, fastened to the outside of the pump cylinder.To adapt the height of the stirrup to the height of the vesselcontaining the water, it is made adjustable in the following manner. Thefoot piece A, terminates into a collar B, which embraces the cylinderand may be slid up and down upon it. It can be secured in any desiredsituation by turning the clamp-screw C, and thus tightening the collarB, around the cylinder.

A perforated nozzle Q, may be screwed to a little screw projecting fromunderneath the foot-piece, as seen in Fig. 1, and unscrewed whenever tobe used.

Figs. 3 and 4, represent a modification of the stirrup, the foot pieceA, being hinged to the collar B, the clamp screw C, serving as thefulcrum of the hinged foot-piece. This foot piece can be turned up intoa vertical position-as represented in red lines in Fig. %to be out ofthe way when the pump is to be packed up or placed aside. Vhen turneddown it is prevented from descending below a horizontal line by the edgeb, of the inclined back a, b, of the foot-piece, coming to rest againstthe collar B. By using such an adjustable stirrup it Will be seen thelower end of the cylinder can be perforated and placed in any suitablevessel containing Water, While if a stirrup is permanently attached tothe bottom end of the cylinder, the cylinder cannot be placed into theWater because the operator would then have to stand in the Water, andthe cylinder must be provided with an additional sucportable pump havinga suction orifice E, 20'

at its bottom, of an adjustable stirrup A, B,vvl1ether the part A ishinged or not; substantially as and for the purposes set forth.

W. J. JOHNSON. Witnesses:

GOODWIN Y. AT LEE, RoBT. W. FENWICK.

